M. Fedorischeva, A. Nikonenko, M. Kalashnikov, I. Bozhko, V. Sergeev
TEM research of the structure of the multilayered coatings consisting of the alternating Si-Al-N and Zr-Y-O layers an equal thickness was carried out. The Zr-Y-O layers in the Zr-Y-O / Si-Al-N multilayer coating have a columnar structure, the diameter of a column reaches 80 nm, the column height is about 1000 nm, which, in this case, corresponds to the thickness of the deposited layer. The structure of the Si-Al-N layers is amorphous. High temperature annealing at 900 °С for 20-120 min leads to a change in the structural-phase state. The untransformable t’ phase appears at a temperature of 900 °С after a 20 minute exposure, the grain size reaches its maximal value after a 70 minute exposure and does not change further.TEM research of the structure of the multilayered coatings consisting of the alternating Si-Al-N and Zr-Y-O layers an equal thickness was carried out. The Zr-Y-O layers in the Zr-Y-O / Si-Al-N multilayer coating have a columnar structure, the diameter of a column reaches 80 nm, the column height is about 1000 nm, which, in this case, corresponds to the thickness of the deposited layer. The structure of the Si-Al-N layers is amorphous. High temperature annealing at 900 °С for 20-120 min leads to a change in the structural-phase state. The untransformable t’ phase appears at a temperature of 900 °С after a 20 minute exposure, the grain size reaches its maximal value after a 70 minute exposure and does not change further.
{"title":"Structural-phase state of the Zr-Y-O layer in the Zr-Y-O/Si Al-N coating at long annealing using «in-situ» observation","authors":"M. Fedorischeva, A. Nikonenko, M. Kalashnikov, I. Bozhko, V. Sergeev","doi":"10.1063/1.5131963","DOIUrl":"https://doi.org/10.1063/1.5131963","url":null,"abstract":"TEM research of the structure of the multilayered coatings consisting of the alternating Si-Al-N and Zr-Y-O layers an equal thickness was carried out. The Zr-Y-O layers in the Zr-Y-O / Si-Al-N multilayer coating have a columnar structure, the diameter of a column reaches 80 nm, the column height is about 1000 nm, which, in this case, corresponds to the thickness of the deposited layer. The structure of the Si-Al-N layers is amorphous. High temperature annealing at 900 °С for 20-120 min leads to a change in the structural-phase state. The untransformable t’ phase appears at a temperature of 900 °С after a 20 minute exposure, the grain size reaches its maximal value after a 70 minute exposure and does not change further.TEM research of the structure of the multilayered coatings consisting of the alternating Si-Al-N and Zr-Y-O layers an equal thickness was carried out. The Zr-Y-O layers in the Zr-Y-O / Si-Al-N multilayer coating have a columnar structure, the diameter of a column reaches 80 nm, the column height is about 1000 nm, which, in this case, corresponds to the thickness of the deposited layer. The structure of the Si-Al-N layers is amorphous. High temperature annealing at 900 °С for 20-120 min leads to a change in the structural-phase state. The untransformable t’ phase appears at a temperature of 900 °С after a 20 minute exposure, the grain size reaches its maximal value after a 70 minute exposure and does not change further.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77392387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The issues of ensuring the accuracy of the filaments’ production for additive manufacturing using the electron beam energy at the stage of drawing of a workpiece made of 12H18N9T steel were considered. The reduction ratio varied in the range from e = 5 % to e = 67.5 %. Calculations showed that the dimensions of a workpiece for producing filaments with a diameter of O 1.3-0.09 mm was limited by O 4.27-0.17 mm. It was experimentally established that the diameter of a filament made of 12H18N9T steel after the last reducing step (1.3 mm) exceeded the allowable diameter (1.3−0,09 mm) and equaled to 1.37 mm. This deviation is probably induced by elasto-plastic strains occurring in the wire in the drawing process. To provide the required accuracy of the filaments with a diameter of O 1.3-0.09 obtained by drawing of 12H18N9T steel, it was recommended to grin the diameter of a die taking into account the magnitude of the elastic deformations, i.e. provide the diameter 0.05 mm smaller than required.
{"title":"Particularities of ensuring the precision of filaments from 12H18N9T steel for additive manufacturing at their fabrication","authors":"V. Yanpolskiy, A. Tyurin, A. Ruktuev","doi":"10.1063/1.5132259","DOIUrl":"https://doi.org/10.1063/1.5132259","url":null,"abstract":"The issues of ensuring the accuracy of the filaments’ production for additive manufacturing using the electron beam energy at the stage of drawing of a workpiece made of 12H18N9T steel were considered. The reduction ratio varied in the range from e = 5 % to e = 67.5 %. Calculations showed that the dimensions of a workpiece for producing filaments with a diameter of O 1.3-0.09 mm was limited by O 4.27-0.17 mm. It was experimentally established that the diameter of a filament made of 12H18N9T steel after the last reducing step (1.3 mm) exceeded the allowable diameter (1.3−0,09 mm) and equaled to 1.37 mm. This deviation is probably induced by elasto-plastic strains occurring in the wire in the drawing process. To provide the required accuracy of the filaments with a diameter of O 1.3-0.09 obtained by drawing of 12H18N9T steel, it was recommended to grin the diameter of a die taking into account the magnitude of the elastic deformations, i.e. provide the diameter 0.05 mm smaller than required.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81355398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Vlasov, N. Surikova, I. Mishin, S. Panin, A. Smirnova, A. Yakovlev, R. Stankevich
Studies on the impact of helical rolling on the structure and mechanical properties of 09Mn2Si pipe steel have been carried out. With the use of transmission electron microscopy it was revealed that the helical rolling gives rise to refinement of ferrite grains as well as fracture of cementite plates within the pearlite phase. This is particularly evident in the surface layer where the degree of strain resulting from the rolling achieved the maximum value. Microhardness measurements have confirmed gradient hardening pattern over the cross section of a rod being induced during the rolling. It is concluded that the most manifested increase of the microhardness takes place at the depth of up to 3 mm. Mechanical properties of the treated steel was estimated under static tension tests. It is shown that helical rolling of 09Mn2Si steel gives rise to increasing of the flow stress (at the yield plateau) and the proportionality limit, while the value of relative elongation has decreased. At the same time, despite of the strengthening induced by the helical rolling the strain hardening takes place in the steel. The latter is manifested through the parabolic hardening at the loading diagram followed by a gradual decrease in the flow stress after the neck formation.Studies on the impact of helical rolling on the structure and mechanical properties of 09Mn2Si pipe steel have been carried out. With the use of transmission electron microscopy it was revealed that the helical rolling gives rise to refinement of ferrite grains as well as fracture of cementite plates within the pearlite phase. This is particularly evident in the surface layer where the degree of strain resulting from the rolling achieved the maximum value. Microhardness measurements have confirmed gradient hardening pattern over the cross section of a rod being induced during the rolling. It is concluded that the most manifested increase of the microhardness takes place at the depth of up to 3 mm. Mechanical properties of the treated steel was estimated under static tension tests. It is shown that helical rolling of 09Mn2Si steel gives rise to increasing of the flow stress (at the yield plateau) and the proportionality limit, while the value of relative elongation has decreased. At the same time, despite ...
{"title":"Modification of structure and mechanical properties of 09Mn2Si pipe steel by helical rolling","authors":"I. Vlasov, N. Surikova, I. Mishin, S. Panin, A. Smirnova, A. Yakovlev, R. Stankevich","doi":"10.1063/1.5132251","DOIUrl":"https://doi.org/10.1063/1.5132251","url":null,"abstract":"Studies on the impact of helical rolling on the structure and mechanical properties of 09Mn2Si pipe steel have been carried out. With the use of transmission electron microscopy it was revealed that the helical rolling gives rise to refinement of ferrite grains as well as fracture of cementite plates within the pearlite phase. This is particularly evident in the surface layer where the degree of strain resulting from the rolling achieved the maximum value. Microhardness measurements have confirmed gradient hardening pattern over the cross section of a rod being induced during the rolling. It is concluded that the most manifested increase of the microhardness takes place at the depth of up to 3 mm. Mechanical properties of the treated steel was estimated under static tension tests. It is shown that helical rolling of 09Mn2Si steel gives rise to increasing of the flow stress (at the yield plateau) and the proportionality limit, while the value of relative elongation has decreased. At the same time, despite of the strengthening induced by the helical rolling the strain hardening takes place in the steel. The latter is manifested through the parabolic hardening at the loading diagram followed by a gradual decrease in the flow stress after the neck formation.Studies on the impact of helical rolling on the structure and mechanical properties of 09Mn2Si pipe steel have been carried out. With the use of transmission electron microscopy it was revealed that the helical rolling gives rise to refinement of ferrite grains as well as fracture of cementite plates within the pearlite phase. This is particularly evident in the surface layer where the degree of strain resulting from the rolling achieved the maximum value. Microhardness measurements have confirmed gradient hardening pattern over the cross section of a rod being induced during the rolling. It is concluded that the most manifested increase of the microhardness takes place at the depth of up to 3 mm. Mechanical properties of the treated steel was estimated under static tension tests. It is shown that helical rolling of 09Mn2Si steel gives rise to increasing of the flow stress (at the yield plateau) and the proportionality limit, while the value of relative elongation has decreased. At the same time, despite ...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"105 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82535783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The objective of the current study was to investigate the effect of ZrO2 ultrafine powder on the structure and properties of the composite coatings obtained from a mixture of thermo-reactive powders of the Ti-B-Fe system. The results of the metallographic and structural x-ray analysis, as well as tribological and hardness analyses showed that the introduction of zirconium dioxide alters the phase composition, reduces the hardness by a factor of 2-4, reduces the grain size, and increases the wear resistance of the coating formed in the process of electron-beam welding.The objective of the current study was to investigate the effect of ZrO2 ultrafine powder on the structure and properties of the composite coatings obtained from a mixture of thermo-reactive powders of the Ti-B-Fe system. The results of the metallographic and structural x-ray analysis, as well as tribological and hardness analyses showed that the introduction of zirconium dioxide alters the phase composition, reduces the hardness by a factor of 2-4, reduces the grain size, and increases the wear resistance of the coating formed in the process of electron-beam welding.
{"title":"The evolution of the structure and properties of the composite electron-beam coatings of Ti-B-Fe system, modified by ZrO2 ultrafine powder","authors":"K. Kolesnikova, N. Gal’chenko","doi":"10.1063/1.5132032","DOIUrl":"https://doi.org/10.1063/1.5132032","url":null,"abstract":"The objective of the current study was to investigate the effect of ZrO2 ultrafine powder on the structure and properties of the composite coatings obtained from a mixture of thermo-reactive powders of the Ti-B-Fe system. The results of the metallographic and structural x-ray analysis, as well as tribological and hardness analyses showed that the introduction of zirconium dioxide alters the phase composition, reduces the hardness by a factor of 2-4, reduces the grain size, and increases the wear resistance of the coating formed in the process of electron-beam welding.The objective of the current study was to investigate the effect of ZrO2 ultrafine powder on the structure and properties of the composite coatings obtained from a mixture of thermo-reactive powders of the Ti-B-Fe system. The results of the metallographic and structural x-ray analysis, as well as tribological and hardness analyses showed that the introduction of zirconium dioxide alters the phase composition, reduces the hardness by a factor of 2-4, reduces the grain size, and increases the wear resistance of the coating formed in the process of electron-beam welding.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82541263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Grishaeva, S. Bochkareva, S. Panin, Le Thi My Hiep, B. Lyukshin, I. Panov, Nguen Duc Ahn
The chemical content of polyphenylene sulfide (PPS) based composite with specified physical–mechanical properties is determined in the study with the use of experimental data on the dependence of effective properties (volumetric wear, elastic modulus, elongation at break, etc.) versus the values of control parameters. The latter are degree of filling with (i) Short Carbon Fibers (SCF) of ∼70 µm long and (ii) Chopped Carbon Fibers (CCF) ∼2 mm long. After the required number of experimental reference points has been determined the technique for data supplementation up to a regular numerical array with the use of linear interpolation is employed. The obtained dependences of the effective properties versus the control parameter values are constructed in the form of surfaces and corresponding isolines. At the contour plots, a region with the required effective properties is then highlighted. Since the regions overlap each other, their intersection determines the allowable control parameters range that impart the required values to the effective properties. The possibility to design filled polymer materials with a complex of predefined strain-strength and tribological properties is demonstrated. The experimental results are used to gain the reference points in contrast to the previously used approach when a set of computational experiment data were employed. On the one hand, the combination of a full-scale laboratory and computational experiments makes the process of modeling and design materials more evident, clear and reasonable from a physical point of view. On the other hand, it allows to interpret the results as more reliable, as well as less time and material consuming.The chemical content of polyphenylene sulfide (PPS) based composite with specified physical–mechanical properties is determined in the study with the use of experimental data on the dependence of effective properties (volumetric wear, elastic modulus, elongation at break, etc.) versus the values of control parameters. The latter are degree of filling with (i) Short Carbon Fibers (SCF) of ∼70 µm long and (ii) Chopped Carbon Fibers (CCF) ∼2 mm long. After the required number of experimental reference points has been determined the technique for data supplementation up to a regular numerical array with the use of linear interpolation is employed. The obtained dependences of the effective properties versus the control parameter values are constructed in the form of surfaces and corresponding isolines. At the contour plots, a region with the required effective properties is then highlighted. Since the regions overlap each other, their intersection determines the allowable control parameters range that impart t...
{"title":"Content optimization of polyphenylene sulfide composites filled with carbon fibers of different size","authors":"N. Grishaeva, S. Bochkareva, S. Panin, Le Thi My Hiep, B. Lyukshin, I. Panov, Nguen Duc Ahn","doi":"10.1063/1.5131988","DOIUrl":"https://doi.org/10.1063/1.5131988","url":null,"abstract":"The chemical content of polyphenylene sulfide (PPS) based composite with specified physical–mechanical properties is determined in the study with the use of experimental data on the dependence of effective properties (volumetric wear, elastic modulus, elongation at break, etc.) versus the values of control parameters. The latter are degree of filling with (i) Short Carbon Fibers (SCF) of ∼70 µm long and (ii) Chopped Carbon Fibers (CCF) ∼2 mm long. After the required number of experimental reference points has been determined the technique for data supplementation up to a regular numerical array with the use of linear interpolation is employed. The obtained dependences of the effective properties versus the control parameter values are constructed in the form of surfaces and corresponding isolines. At the contour plots, a region with the required effective properties is then highlighted. Since the regions overlap each other, their intersection determines the allowable control parameters range that impart the required values to the effective properties. The possibility to design filled polymer materials with a complex of predefined strain-strength and tribological properties is demonstrated. The experimental results are used to gain the reference points in contrast to the previously used approach when a set of computational experiment data were employed. On the one hand, the combination of a full-scale laboratory and computational experiments makes the process of modeling and design materials more evident, clear and reasonable from a physical point of view. On the other hand, it allows to interpret the results as more reliable, as well as less time and material consuming.The chemical content of polyphenylene sulfide (PPS) based composite with specified physical–mechanical properties is determined in the study with the use of experimental data on the dependence of effective properties (volumetric wear, elastic modulus, elongation at break, etc.) versus the values of control parameters. The latter are degree of filling with (i) Short Carbon Fibers (SCF) of ∼70 µm long and (ii) Chopped Carbon Fibers (CCF) ∼2 mm long. After the required number of experimental reference points has been determined the technique for data supplementation up to a regular numerical array with the use of linear interpolation is employed. The obtained dependences of the effective properties versus the control parameter values are constructed in the form of surfaces and corresponding isolines. At the contour plots, a region with the required effective properties is then highlighted. Since the regions overlap each other, their intersection determines the allowable control parameters range that impart t...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79969234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Soboleva, A. Makarov, P. Skorynina, E. Nikolaeva, I. Malygina
The authors consider the hardness and surface finish of the composite NiCrBSi–Cr3C2 laser clad coating after frictional treatment with a dense cubic boron nitride (DBN) indenter in air at loads on the indenter of 350, 500 and 700 N in comparison with the surface characteristics after grinding. Frictional treatment in all cases leads to surface hardening. Frictional treatment at loads of 350–500 N ensures the formation of surfaces with the lowest roughness parameters and contributes to the preservation on the surface of large hard chromium carbides, while frictional treatment at a load of 700 N causes the destruction of Cr3C2 carbides on the surface of the coating.The authors consider the hardness and surface finish of the composite NiCrBSi–Cr3C2 laser clad coating after frictional treatment with a dense cubic boron nitride (DBN) indenter in air at loads on the indenter of 350, 500 and 700 N in comparison with the surface characteristics after grinding. Frictional treatment in all cases leads to surface hardening. Frictional treatment at loads of 350–500 N ensures the formation of surfaces with the lowest roughness parameters and contributes to the preservation on the surface of large hard chromium carbides, while frictional treatment at a load of 700 N causes the destruction of Cr3C2 carbides on the surface of the coating.
{"title":"The effect of load during frictional treatment with a DBN indenter on the surface finish of the NiCrBSi–Cr3C2 laser clad coating","authors":"N. Soboleva, A. Makarov, P. Skorynina, E. Nikolaeva, I. Malygina","doi":"10.1063/1.5132212","DOIUrl":"https://doi.org/10.1063/1.5132212","url":null,"abstract":"The authors consider the hardness and surface finish of the composite NiCrBSi–Cr3C2 laser clad coating after frictional treatment with a dense cubic boron nitride (DBN) indenter in air at loads on the indenter of 350, 500 and 700 N in comparison with the surface characteristics after grinding. Frictional treatment in all cases leads to surface hardening. Frictional treatment at loads of 350–500 N ensures the formation of surfaces with the lowest roughness parameters and contributes to the preservation on the surface of large hard chromium carbides, while frictional treatment at a load of 700 N causes the destruction of Cr3C2 carbides on the surface of the coating.The authors consider the hardness and surface finish of the composite NiCrBSi–Cr3C2 laser clad coating after frictional treatment with a dense cubic boron nitride (DBN) indenter in air at loads on the indenter of 350, 500 and 700 N in comparison with the surface characteristics after grinding. Frictional treatment in all cases leads to surface hardening. Frictional treatment at loads of 350–500 N ensures the formation of surfaces with the lowest roughness parameters and contributes to the preservation on the surface of large hard chromium carbides, while frictional treatment at a load of 700 N causes the destruction of Cr3C2 carbides on the surface of the coating.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79288349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Osipov, I. Smirnov, K. V. Grinyaev, V. Melnikov, M. Korchagin, I. Ditenberg
Using scanning electron microscopy (EBSD analysis) and microindentation, we studied the features of the grain structure and the microhardness level of Ni3Al samples after synthesis and annealing at different temperatures. The effects of the duration of preliminary mechanical activation on the microstructure and microhardness of the intermetallic samples were revealed both after spark plasma sintering and subsequent heat treatments.Using scanning electron microscopy (EBSD analysis) and microindentation, we studied the features of the grain structure and the microhardness level of Ni3Al samples after synthesis and annealing at different temperatures. The effects of the duration of preliminary mechanical activation on the microstructure and microhardness of the intermetallic samples were revealed both after spark plasma sintering and subsequent heat treatments.
{"title":"Thermal stability of microstructure and microhardness of Ni3Al samples with different duration of preliminary mechanical activation","authors":"D. Osipov, I. Smirnov, K. V. Grinyaev, V. Melnikov, M. Korchagin, I. Ditenberg","doi":"10.1063/1.5132120","DOIUrl":"https://doi.org/10.1063/1.5132120","url":null,"abstract":"Using scanning electron microscopy (EBSD analysis) and microindentation, we studied the features of the grain structure and the microhardness level of Ni3Al samples after synthesis and annealing at different temperatures. The effects of the duration of preliminary mechanical activation on the microstructure and microhardness of the intermetallic samples were revealed both after spark plasma sintering and subsequent heat treatments.Using scanning electron microscopy (EBSD analysis) and microindentation, we studied the features of the grain structure and the microhardness level of Ni3Al samples after synthesis and annealing at different temperatures. The effects of the duration of preliminary mechanical activation on the microstructure and microhardness of the intermetallic samples were revealed both after spark plasma sintering and subsequent heat treatments.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80161187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The structure of a nanocrystalline Ti–50.9 at. % Ni alloy with mixed subgrain/nanograin structure is investigated by transmission electron microscopy after annealing at temperature 400°C. The size, morphology and distribution of Ti3Ni4 particles formed in the process of the decomposition of a TiNi B2 solid solution are investigated. It is shown that the Ti3Ni4 particles precipitate in the substructure in the low-angle boundaries regions. The precipitation of coherent particles in subgrains is possible with the latter sizes less than 100 nm. At the same time, precipitations of Ti3Ni4 particles are not observed inside the nanograins.The structure of a nanocrystalline Ti–50.9 at. % Ni alloy with mixed subgrain/nanograin structure is investigated by transmission electron microscopy after annealing at temperature 400°C. The size, morphology and distribution of Ti3Ni4 particles formed in the process of the decomposition of a TiNi B2 solid solution are investigated. It is shown that the Ti3Ni4 particles precipitate in the substructure in the low-angle boundaries regions. The precipitation of coherent particles in subgrains is possible with the latter sizes less than 100 nm. At the same time, precipitations of Ti3Ni4 particles are not observed inside the nanograins.
{"title":"Ti3Ni4 precipitation in heat-treated nanocrytalline Ti – 50.9 at. % Ni alloy","authors":"S. Girsova, T. Poletika","doi":"10.1063/1.5131979","DOIUrl":"https://doi.org/10.1063/1.5131979","url":null,"abstract":"The structure of a nanocrystalline Ti–50.9 at. % Ni alloy with mixed subgrain/nanograin structure is investigated by transmission electron microscopy after annealing at temperature 400°C. The size, morphology and distribution of Ti3Ni4 particles formed in the process of the decomposition of a TiNi B2 solid solution are investigated. It is shown that the Ti3Ni4 particles precipitate in the substructure in the low-angle boundaries regions. The precipitation of coherent particles in subgrains is possible with the latter sizes less than 100 nm. At the same time, precipitations of Ti3Ni4 particles are not observed inside the nanograins.The structure of a nanocrystalline Ti–50.9 at. % Ni alloy with mixed subgrain/nanograin structure is investigated by transmission electron microscopy after annealing at temperature 400°C. The size, morphology and distribution of Ti3Ni4 particles formed in the process of the decomposition of a TiNi B2 solid solution are investigated. It is shown that the Ti3Ni4 particles precipitate in the substructure in the low-angle boundaries regions. The precipitation of coherent particles in subgrains is possible with the latter sizes less than 100 nm. At the same time, precipitations of Ti3Ni4 particles are not observed inside the nanograins.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77715855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the paper, we discuss an approach to the development of methods for managing seismotectonic deformation processes in a multiscale block-structured Earth’s Crust from the viewpoint of the concept of physical mesomechanics. To date, there are no convincing results of many year researches in the fields of earthquake prediction and prevention of the dangerous man-caused and tectonic earthquakes. Therefore, in recent decades, there has been an increasingly active search for new ways to solve the problem of seismic safety. The aim of our research team’s activity is to provide a scientific rationale for a multidisciplinary approach to reduce the excess level of shear stresses in the fault zones to a safe background level by “spending” it on mechanical destruction and thermal processes in rocks during aseismic and co-seismic slip. The authors summarize the main results of modeling of geological and geophysical processes in the field of preparation of different scale seismogenic events, as well as the results of complex man-made impacts on segments of seismically active faults. The data obtained on segments of different scale faults within the Baikal rift zone and Mongolia confirm the possibility of implementing such an approach. For the practical implementation of such a project at highly stressed fault zones, it is necessary to carry out vertical, oblique and horizontal multilateral drilling with an injection of fluids of different compositions in combination with vibro-pulse stimulations to achieve safe relaxation of shear stresses.
{"title":"Physical mesomechanics based interdisciplinary approach to the development of new methods for managing deformation process in fault zones","authors":"V. Ruzhich, S. Psakhie, E. Shilko, E. Levina","doi":"10.1063/1.5132167","DOIUrl":"https://doi.org/10.1063/1.5132167","url":null,"abstract":"In the paper, we discuss an approach to the development of methods for managing seismotectonic deformation processes in a multiscale block-structured Earth’s Crust from the viewpoint of the concept of physical mesomechanics. To date, there are no convincing results of many year researches in the fields of earthquake prediction and prevention of the dangerous man-caused and tectonic earthquakes. Therefore, in recent decades, there has been an increasingly active search for new ways to solve the problem of seismic safety. The aim of our research team’s activity is to provide a scientific rationale for a multidisciplinary approach to reduce the excess level of shear stresses in the fault zones to a safe background level by “spending” it on mechanical destruction and thermal processes in rocks during aseismic and co-seismic slip. The authors summarize the main results of modeling of geological and geophysical processes in the field of preparation of different scale seismogenic events, as well as the results of complex man-made impacts on segments of seismically active faults. The data obtained on segments of different scale faults within the Baikal rift zone and Mongolia confirm the possibility of implementing such an approach. For the practical implementation of such a project at highly stressed fault zones, it is necessary to carry out vertical, oblique and horizontal multilateral drilling with an injection of fluids of different compositions in combination with vibro-pulse stimulations to achieve safe relaxation of shear stresses.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82295355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper deals with the investigation of ultrasonic impact post-build treatment of SLM-manufactured Ti-6Al-4V. SLM blanks were cut along building direction and subjected to ultrasonic impact surface treatment. Post-build treated specimens were tested by uniaxial tensile testing with in situ strain monitoring via digital image correlation technique (DIC), while the fracture surfaces were studied by scanning electron microscopy (SEM). The analysis of the experimental data allowed revealing the effect of post-build treatment on mechanical properties and on the peculiarities of deformation behavior. Analysis of SEM images of fracture surfaces allowed us to distinguish the differences between structure influence onto failure pattern both for the treated and non-treated specimens.The paper deals with the investigation of ultrasonic impact post-build treatment of SLM-manufactured Ti-6Al-4V. SLM blanks were cut along building direction and subjected to ultrasonic impact surface treatment. Post-build treated specimens were tested by uniaxial tensile testing with in situ strain monitoring via digital image correlation technique (DIC), while the fracture surfaces were studied by scanning electron microscopy (SEM). The analysis of the experimental data allowed revealing the effect of post-build treatment on mechanical properties and on the peculiarities of deformation behavior. Analysis of SEM images of fracture surfaces allowed us to distinguish the differences between structure influence onto failure pattern both for the treated and non-treated specimens.
{"title":"Static fracture behavior of ultrasonic impact post-built treated SLM-manufactured Ti-6Al-4V","authors":"M. Burkov, A. Eremin, A. Byakov, S. Panin","doi":"10.1063/1.5131908","DOIUrl":"https://doi.org/10.1063/1.5131908","url":null,"abstract":"The paper deals with the investigation of ultrasonic impact post-build treatment of SLM-manufactured Ti-6Al-4V. SLM blanks were cut along building direction and subjected to ultrasonic impact surface treatment. Post-build treated specimens were tested by uniaxial tensile testing with in situ strain monitoring via digital image correlation technique (DIC), while the fracture surfaces were studied by scanning electron microscopy (SEM). The analysis of the experimental data allowed revealing the effect of post-build treatment on mechanical properties and on the peculiarities of deformation behavior. Analysis of SEM images of fracture surfaces allowed us to distinguish the differences between structure influence onto failure pattern both for the treated and non-treated specimens.The paper deals with the investigation of ultrasonic impact post-build treatment of SLM-manufactured Ti-6Al-4V. SLM blanks were cut along building direction and subjected to ultrasonic impact surface treatment. Post-build treated specimens were tested by uniaxial tensile testing with in situ strain monitoring via digital image correlation technique (DIC), while the fracture surfaces were studied by scanning electron microscopy (SEM). The analysis of the experimental data allowed revealing the effect of post-build treatment on mechanical properties and on the peculiarities of deformation behavior. Analysis of SEM images of fracture surfaces allowed us to distinguish the differences between structure influence onto failure pattern both for the treated and non-treated specimens.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88014318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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